CN104094153A - Imaging lens and imaging device equipped with same - Google Patents
Imaging lens and imaging device equipped with same Download PDFInfo
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- CN104094153A CN104094153A CN201380008213.2A CN201380008213A CN104094153A CN 104094153 A CN104094153 A CN 104094153A CN 201380008213 A CN201380008213 A CN 201380008213A CN 104094153 A CN104094153 A CN 104094153A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
- G02B15/144511—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+-+
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Abstract
[Problem] To provide an imaging lens, wherein the focus group is reduced in weight, and spherical aberration, astigmatism and other types of aberration, together with chromatic aberration, are corrected satisfactorily. [Solution] The following lens groups are arranged in order from the object side: a negative first lens group (G1) comprising, arranged from the object side, a biconvex lens (L11), a cemented lens (L12), and a plurality of lenses (E1) containing a positive lens (L1alpha) and a negative lens (L1beta); a positive second lens group (G2) containing a cemented lens (L2gamma); a negative third lens group (G3) which moves during focusing, and which is obtained by a single lens having a meniscus shape with the protruding surface facing towards the object side or by positioning a plurality of lenses constituted in such a manner that the lens surface positioned closest to the image has an absolute value for the radius of curvature that is smaller than that of the lens surface positioned closest to the object; and a positive fourth group (G4) containing a positive lens. The imaging lens is constituted in such a matter that the following conditional expression is satisfied: (1): 0.7 <|f3|/f<4.0. Therein, f3 is the focal length of the third lens group (G3), and f is the focal length of the entire lens system.
Description
Technical field
The present invention relates to for digital camera, play small-sized, the high performance imaging lens system with video camera etc. with camera, film shooting.
Background technology
All the time, in order to make focus concentrate (focus) from a distant place to each object distance nearby, known have the integral telescopic of the lens combination of making or only make to form the mode (with reference to citing document 1,2,3) that the lens of a part for this lens combination move.In addition, in order to shorten the time that reaches focus, the lightweight of the lens combination (focus groups) moving while require to realize focusing on, alleviate the burden of focus mechanism, but in this case, the lens that are applicable to only making forming a part for lens combination move and make it the mode of focus.So only mobile a part of lens and make it the mode of focus, use at zoom lens with in having adopted the fix-focus lens of interior focusing mode, also known have focus groups is configured in to diaphragm after and the telephoto lens with large aperture ratio of formation.
[look-ahead technique document]
[patent documentation]
[patent documentation 1] JP 2011-232624 communique
[patent documentation 2] JP 2006-53377 communique
No. 3084810 communique of [patent documentation 3] patent
But, the imaging lens system described in patent documentation 2 and 3, the external diameter thickness large or lens of lens that forms focus groups is thick, so focus groups is heavy, the large such problem of burden while making it mobile exists.
In addition, the imaging lens system described in document 2 and 3, near the low region of light height diaphragm, chromatic aberation cannot be proofreaied and correct fully, and chromatic aberation on axle occurs.In order to bring into play good optical property during by white light at imaging lens system, require to proofread and correct such chromatic aberation.
Summary of the invention
The present invention In view of the foregoing forms, and its object is, provide a kind of can make focus groups more lightweight and except all aberrations of spherical aberration and astigmatism etc. the imaging lens system of correcting chromatic aberration and used its camera head well.
Imaging lens system of the present invention, it is characterized in that, in fact by the 1st lens combination with negative power configuring successively from object side, diaphragm, the 2nd lens combination with positive light coke, the 3rd lens combination with negative power, these 4 groups with the 4th lens combination of positive light coke form, only make the 3rd lens combination move and focus along optical axis direction, the 1st lens combination, from object side successively by biconvex lens, make to have the lens and the balsaming lens with the lens joint of negative power of positive light coke, containing at least 1 above poly-lens of lens difference that has the lens of positive light coke and have negative power forms, the 2nd lens combination contains: by having the lens of positive light coke and having balsaming lens that the lens of negative power form more than at least 1, the 3rd lens combination, by the simple lens with negative power that is meniscus shape that makes convex surface towards object side, formed, or, absolute value by comparing at the absolute value of the radius-of-curvature of the lens face of object side (also claim by object side) configuration in the radius-of-curvature of the lens face configuring as side (also claim by picture side) is little, and the poly-lens on the whole with negative power forms, the 4th lens combination contains the lens a slice at least with positive light coke, the formula that satisfies condition (1): 0.7 < | f3|/f < 4.0.Wherein, f3 is the focal length of the 3rd lens combination, and f is the system-wide focal lengths of the lens under the state of infintie object point focus.
Described the 3rd lens combination, in order to make it mobile from infintie object point to nearest object point with interior focusing mode focus.
Also have, the poly-lens in the 1st lens combination, is configured between described balsaming lens and described diaphragm, and in this poly-lens, the lens with positive light coke comprise respectively more than 1 with the lens with negative power.
Described the 3rd lens combination, to make convex surface towards the simple lens with negative power that is meniscus shape of object side, or, the 3rd lens combination consists of the poly-lens on the whole with negative power, its constituted mode is, compare the absolute value of radius-of-curvature of the lens face in object side configuration of this poly-lens, and in this poly-lens the absolute value as the radius-of-curvature of the lens face of side configuration is little.
Described imaging lens system, the formula that preferably satisfies condition (1 '): 1.0 < | f3|/f < 3.0, the formula that more preferably satisfies condition (1 "): 1.2 < | f3|/f < 2.0.
Described imaging lens system, the formula that preferably satisfies condition (2): 0.6 < | f1|/f < 18.0, more preferably the formula that satisfies condition (2 '): 1.2 < | f1|/f < 10.0, the formula that further preferably satisfies condition (2 "): 2.5 < | f1|/f < 4.5.
Wherein, f1 is the focal length of the 1st lens combination.
Described imaging lens system, the formula that preferably satisfies condition (3): 0.2 < f2/f < 5.0, more preferably the formula that satisfies condition (3 '): 0.5 < f2/f < 3.5, the formula that further preferably satisfies condition (3 "): 0.8 < f2/f < 1.2.
Wherein, f2 is the focal length of the 2nd lens combination.
Described imaging lens system, the formula that preferably satisfies condition (4): 0.8 < f4/f < 8.0, more preferably the formula that satisfies condition (4 '): 1.0 < f4/f < 4.0, the formula that further preferably satisfies condition (4 "): 1.3 < f4/f < 1.8.
Wherein, f4 is the focal length of the 4th lens combination.
Described imaging lens system, the < 6.0 of the formula that preferably satisfies condition (5): 0.5 < (R3f+R3r)/(R3f-R3r), more preferably the < 4.5 of the formula that satisfies condition (5 '): 1.0 < (R3f+R3r)/(R3f-R3r), the formula that the further preferably satisfies condition (< 2.5 of 5 "): 1.3 < (R3f+R3r)/(R3f-R3r).
Wherein, R3f is the radius-of-curvature of the lens face in object side configuration of the 3rd lens combination, R3r be the 3rd lens combination as the radius-of-curvature of the lens face of side configuration.
Described the 1st lens combination comprise by thering are the lens of positive light coke and thering is at least 1 among the balsaming lens that the lens of negative power form, the formula that preferably satisfies condition (6): 22.0 < | vd (1P)-vd (1N) |, more preferably the formula that satisfies condition (6 '): 35.0 < | vd (1P)-vd (1N) |, the formula that further preferably satisfies condition (6 "): 50.0 < | vd (1P)-vd (1N) |.
In addition, described the 1st lens combination comprise by thering are the lens of positive light coke and thering is at least 1 among the balsaming lens that the lens of negative power form, the formula that preferably satisfies condition (6): 22.0 < | vd (1P)-vd (1N) |, more preferably the formula that satisfies condition (6 " '): vd (1P)-vd (1N) <-22.0, the formula that further preferably satisfies condition (6 " "): vd (1P)-vd (1N) <-35.0.
Wherein, vd (1P) is for forming the Abbe number of the lens with positive light coke of balsaming lens, and vd (1N) is for forming the Abbe number of the lens with negative power of balsaming lens.
Described imaging lens system, the 1st lens combination as side configuration has the lens of positive light coke, form the 1st lens combination time, the 2nd lens combination comprise by thering are the lens of positive light coke and having among the balsaming lens that the lens of negative power form, the balsaming lens of the absolute value maximum of the difference of the Abbe number between 2 lens that are bonded with each other, preferably meet following conditional (7): 20.0 < | vd (2P)-vd (2N) |, and, conditional (8) below the lens with positive light coke configuring as side of the 1st lens combination meet: vd (1R) < 35.0.
Wherein, vd (2P) is for forming the Abbe number of the lens with positive light coke of balsaming lens, vd (2N) is for forming the Abbe number of the lens with negative power of balsaming lens, and vd (1R) is the Abbe number at the lens that configure as side of the 1st lens combination.
Described imaging lens system, more preferably the formula that satisfies condition (7 '): 32.0 < | vd (2P)-vd (2N) |, the formula that further preferably satisfies condition (7 "): 48.0 < | vd (2P)-vd (2N) |.
Described imaging lens system formula (8 '): vd (1R) < 30.0 that more preferably satisfies condition.
Camera head of the present invention, is characterized in that, possesses described imaging lens system.
Also have; so-called " imaging lens system being formed by 4 groups in fact "; except 4 groups, also contain mechanism's part etc. that optical element, lens flange, lens barrel, imaging apparatus, hand beyond the lens such as lens, diaphragm and cover glass that do not possess in fact focal power trembled correcting mechanism etc.So, the imaging lens system consisting of 4 groups, can only consist of 4 groups, or, except 4 groups, also can have and not possess the lens of focal power and the optical element beyond lens etc.
The symbol of the radius-of-curvature of lens face, for just, is negative when protruding to picture side when protruding to object side.
The focal length of the focal length of the focal length of each lens, the poly-lens combining (synthetic focal length), lens combination is respectively with positive and negative difference.
According to imaging lens system of the present invention with used its camera head, because its constituted mode is, in fact by the 1st lens combination with negative power configuring successively from object side, diaphragm, the 2nd lens combination with positive light coke, the 3rd lens combination with negative power, these 4 groups with the 4th lens combination of positive light coke form, only make the 3rd lens combination move and focus along optical axis direction, the 1st lens combination, from object side successively by biconvex lens, make to have the lens and the balsaming lens with the lens joint of negative power of positive light coke, the poly-lens that contains the lens that have the lens of positive light coke and have negative power forms, the 2nd lens combination contains: by having the lens of positive light coke and having the balsaming lens that the lens of negative power form, the 3rd lens combination, by the simple lens with negative power that is meniscus shape that makes convex surface towards object side, or poly-lens forms, this poly-lens has negative power on the whole, and in this poly-lens the absolute value by the radius-of-curvature of the lens face that configures as side is less than the absolute value of the radius-of-curvature of the lens face configuring by object side, the 4th lens combination comprises the lens with positive light coke, and the formula that satisfies condition (1): 0.7 < | f3|/f < 4.0, so can make the further lightweight of the 3rd lens combination as focus groups, and, except all aberrations of spherical aberration and astigmatism etc., correcting chromatic aberration well.
Also have, conditional (1) regulation be the focal power of the 3rd lens combination, by so suitably setting the focal power of focus groups, can suitably determine the amount of movement of focus groups, and can positively follow focus groups movement and aberration correction.
If the mode with the upper limit higher than conditional (1) forms imaging lens system, focal power dies down, and the amount of movement of the 3rd lens combination while focusing increases.On the other hand, if form imaging lens system in the mode of the lower limit lower than conditional (1), the tendency that aberration of curvature of the image excessively (is proofreaied and correct superfluous) improves (proofreading and correct superfluous possibility uprises).
Accompanying drawing explanation
Fig. 1 means the sectional view that the summary of the imaging lens system of embodiments of the present invention forms
Fig. 2 means the sectional view that the summary of the imaging lens system of embodiment 1 forms
Fig. 3 means the sectional view that the summary of the imaging lens system of embodiment 2 forms
Fig. 4 means the sectional view that the summary of the imaging lens system of embodiment 3 forms
Fig. 5 means the sectional view that the summary of the imaging lens system of embodiment 4 forms
Fig. 6 means the sectional view that the summary of the imaging lens system of embodiment 5 forms
Fig. 7 means the sectional view that the summary of the imaging lens system of embodiment 6 forms
Fig. 8 means the sectional view that the summary of the imaging lens system of embodiment 7 forms
Fig. 9 A is the aberration diagram (IFN) of the imaging lens system of embodiment 1
Fig. 9 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 1
Fig. 9 C is the aberration diagram (MOD) of the imaging lens system of embodiment 1
Figure 10 A is the aberration diagram (IFN) of the imaging lens system of embodiment 2
Figure 10 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 2
Figure 10 C is the aberration diagram (MOD) of the imaging lens system of embodiment 2
Figure 11 A is the aberration diagram (IFN) of the imaging lens system of embodiment 3
Figure 11 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 3
Figure 11 C is the aberration diagram (MOD) of the imaging lens system of embodiment 3
Figure 12 A is the aberration diagram (IFN) of the imaging lens system of embodiment 4
Figure 12 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 4
Figure 12 C is the aberration diagram (MOD) of the imaging lens system of embodiment 4
Figure 13 A is the aberration diagram (IFN) of the imaging lens system of embodiment 5
Figure 13 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 5
Figure 13 C is the aberration diagram (MOD) of the imaging lens system of embodiment 5
Figure 14 A is the aberration diagram (IFN) of the imaging lens system of embodiment 6
Figure 14 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 6
Figure 14 C is the aberration diagram (MOD) of the imaging lens system of embodiment 6
Figure 15 A is the aberration diagram (IFN) of the imaging lens system of embodiment 7
Figure 15 B is the aberration diagram (benchmark) of the imaging lens system of embodiment 7
Figure 15 C is the aberration diagram (MOD) of the imaging lens system of embodiment 7
Figure 16 means the figure of the camera head that is equipped with imaging lens system of the present invention
Embodiment
Below, with reference to accompanying drawing, for imaging lens system of the present invention and used its camera head to describe.
Fig. 1 is the sectional view that the summary of imaging lens system of the present invention forms.Also have, arrow X, Y, Z in arrow X, the Y in Fig. 1, Z and figure described later are same, represent 3 mutually orthogonal directions, the direction that arrow Z direction indication is identical with optical axis Z1.
Also have, in the following description, the lens with positive light coke are called to positive lens, the lens with negative power are called negative lens, and the lens combination with positive light coke is called to positive lens combination, and the lens combination with negative power is called negative lens combination.
Imaging lens system 100 shown in Fig. 1, consists of 4 groups, from object side dispose successively negative the 1st lens combination G1, aperture diaphragm St, positive the 2nd lens combination G2, the 3rd negative lens combination G3, the 4th positive lens combination G4 forms.This imaging lens system 100, only makes the 3rd lens combination G3 move and focus along optical axis direction, from infintie object point to the focus of nearest object point, in interior focusing mode, carries out.
In addition, the imaging apparatus 210 shown in Fig. 1, by by imaging lens system 100 on the light receiving surface 210j of this imaging apparatus 210 the optical image Im of the expression subject 1 of imaging convert electric signal to, output represents the picture signal Gs of this optical image Im.
Also have, between imaging lens system 100 and imaging apparatus 210, dispose the optical element LL that there is no focal power of cover glass and low pass filter or infrared intercepting filter etc.
The 1st lens combination G1, configures successively following lens from object side and forms: the 1st group of the 1st lens L11 consisting of biconvex lens; The 1st group of the 2nd lens L12 as balsaming lens being formed by positive lens L12a and negative lens L12b; Contain respectively 1 above poly-lens of positive lens and negative lens.Also have, with symbol E1, represent above-mentioned poly-lens, the negative lens that poly-lens E1 comprises represents with symbol L1 α, and the positive lens that poly-lens E1 comprises is represented by symbol L1 β.
The 2nd lens combination G2, its constituted mode is at least to contain the balsaming lens L2 γ consisting of positive lens L2 γ a and negative lens L2 γ b.
The 3rd lens combination G3, to make convex surface towards the simple lens with negative power that is meniscus shape (representing with symbol L3 ε in figure) of object side, or, the 3rd lens combination G3 consists of poly-lens (being represented by symbol E3 in figure), its constituted mode is, less than the absolute value of the radius-of-curvature of the lens face Sp configuring at object side at the absolute value of the radius-of-curvature of the lens face Sq configuring as side, and there is on the whole negative power.
The 4th lens combination G4 at least contains positive lens L4 δ.
In addition, this imaging lens system 100, the formula that satisfies condition (1): 0.7 < | f3|/f < 4.0.Wherein, f3 is the focal length of the 3rd lens combination G3, and f is the system-wide focal lengths of the lens under the state of infintie object point focus.
This imaging lens system 100, the formula that preferably satisfies condition (1 '): 1.0 < | f3|/f < 3.0, the formula that more preferably satisfies condition (1 "): 1.2 < | f3|/f < 2.0.
In addition, imaging lens system 100, the formula that preferably satisfies condition (2): 0.6 < | f1|/f < 18.0, more preferably the formula that satisfies condition (2 '): 1.2 < | f1|/f < 10.0, the formula that further preferably satisfies condition (2 "): 2.5 < | f1|/f < 4.5.Wherein, f1 is the focal length of the 1st lens combination G1.
This conditional (2), is the formula of the focal power of regulation the 1st lens combination G1, by the scope of setting focal power like this, can proofread and correct all aberrations of curvature of the image aberration and coma aberration (also claiming coma) etc.
If the mode with the upper limit higher than conditional (2) forms imaging lens system 100, the tendency that curvature of the image aberration excessively (is proofreaied and correct superfluous) improves.In addition, it is large that the lens diameter of object side becomes, and it is large that the weight of these lens also becomes.On the other hand, if form imaging lens system 100 in the mode of the lower limit lower than conditional (2), the tendency of curvature of the image aberration not enough (undercorrection) improves.Coma aberration cannot fully be inhibited in addition.
In addition, imaging lens system 100, the formula that preferably satisfies condition (3): 0.2 < f2/f < 5.0, more preferably the formula that satisfies condition (3 '): 0.5 < f2/f < 3.5, the formula that further preferably satisfies condition (3 "): 0.8 < f2/f < 1.2.Wherein, f2 is the focal length of the 2nd lens combination G2.
Conditional (3) is the formula of focal power of regulation the 2nd lens combination G2, by the scope of setting focal power like this, can correcting spherical aberration and chromatic aberation, and can guarantee good optical property.
If higher than the upper limit of conditional (3), the excessive tendency of spherical aberration improves, chromatic aberation undercorrection.On the other hand, if lower than the lower limit of conditional (3), the tendency of spherical aberration deficiency improves, and chromatic aberation is proofreaied and correct superfluous.
In addition, imaging lens system 100, the formula that preferably satisfies condition (4): 0.8 < f4/f < 8.0, more preferably the formula that satisfies condition (4 '): 1.0 < f4/f < 4.0, the formula that further preferably satisfies condition (4 "): 1.3 < f4/f < 1.8.
Wherein, f4 is the focal length of the 4th lens combination G4.
Conditional (4) is the formula of the focal power of regulation the 4th lens combination G4, by the scope of setting focal power like this, can suppress the generation of spherical aberration.
If higher than the upper limit of conditional (4), the tendency of spherical aberration over-correction improves.On the other hand, if lower than the lower limit of conditional (4), the tendency of spherical aberration correction deficiency improves.
In addition, imaging lens system 100, the < 6.0 of the formula that preferably satisfies condition (5): 0.5 < (R3f+R3r)/(R3f-R3r), more preferably the < 4.5 of the formula that satisfies condition (5 '): 1.0 < (R3f+R3r)/(R3f-R3r), the formula that the further preferably satisfies condition (< 2.5 of 5 "): 1.3 < (R3f+R3r)/(R3f-R3r).Wherein, R3f is the radius-of-curvature of the lens face Sp configuring at object side of the 3rd lens combination G3, and R3r is the radius-of-curvature at the lens face Sq configuring as side of the 3rd lens combination G3.
Conditional (5) is for suitably stipulating the lens shape of focus groups, if not within the scope of this, the correction of curvature of the image aberration becomes difficult.
That is, if form imaging lens system 100 in the mode of the upper limit higher than conditional (5), curvature of the image aberration cannot be proofreaied and correct fully, and the tendency of curvature of the image correction not enough (undercorrection) improves.On the other hand, if form imaging lens system 100 in the mode of the lower limit lower than conditional (5), curvature of the image aberration cannot be proofreaied and correct fully, and the tendency of curvature of the image over-correction (proofreading and correct superfluous) improves.
In addition, the 1st lens combination G1 comprises, among the balsaming lens being formed by positive lens and negative lens at least 1, and the formula that preferably satisfies condition (6): 22.0 < | vd (1P)-vd (1N) |.At this, imaging lens system 100, more preferably the formula that satisfies condition (6 '): 35.0 < | vd (1P)-vd (1N) |, the formula that further preferably satisfies condition (6 "): 50.0 < | vd (1P)-vd (1N) |.In addition, imaging lens system 100, compare the formula of satisfying condition (6): 22.0 < | vd (1P)-vd (1N) | situation, more preferably the formula that satisfies condition (6 " '): vd (1P)-vd (1N) <-22.0, the formula that further preferably satisfies condition (6 " "): vd (1P)-vd (1N) <-35.0.
Wherein, vd (1P) is the Abbe number that forms the positive lens of balsaming lens, and vd (1N) is the Abbe number that forms the negative lens of above-mentioned balsaming lens.
What conditional (6) was stipulated is the Abbe number of balsaming lens in the 1st lens combination G1, that consist of positive lens and negative lens.This conditional (6) relates to the correction of multiplying power chromatic aberation, is the conditional that obtains good optical property when by white light.
If lower than the lower limit of conditional (6), cannot carry out fully the correction of multiplying power chromatic aberation, in the large region of image height, about the tendency of the multiplying power chromatic aberation overcorrect of the short light of wavelength (proofreading and correct superfluous), improve.
In addition, if in the 1st lens combination G1 as side configuration positive lens time (for example, making this positive lens is positive lens L1 β), among the balsaming lens being formed by positive lens and negative lens that preferably the 2nd lens combination G2 comprises, the absolute value of the difference of the Abbe number between above-mentioned positive lens and negative lens is maximum balsaming lens, the formula that satisfies condition (7): 20.0 < | vd (2P)-vd (2N) |, and, the positive lens L1 β configuring as side in the 1st lens combination G1 formula (8): vd (1R) < 35.0 that satisfies condition, so form imaging lens system 100.
Also have, " the maximum balsaming lens of difference of the Abbe number between positive lens and negative lens ", equivalent in meaning with " at the Abbe number of the lens of object side configuration with at the balsaming lens of the absolute value maximum of the difference of the Abbe number of the lens of picture side configuration ".
In addition, imaging lens system 100, more preferably the formula that satisfies condition (7 '): 32.0 < | vd (2P)-vd (2N) |, the formula that further preferably satisfies condition (7 "): 48.0 < | vd (2P)-vd (2N) |.
In addition, this imaging lens system 100 formula (8 '): vd (1R) < 30.0 that more preferably satisfies condition.
With regard to conditional (7) and conditional (8), about the correction of chromatic aberation on axle, and be for imaging lens system 100 being obtained to the formula of good optical property during by white light.
If lower than the lower limit of conditional (7), cannot carry out fully the correction of chromatic aberation on axle, about the tendency raising of chromatic aberation overcorrect on the axle of the long light of ripple (proofreading and correct superfluous).In addition, if higher than the upper limit of conditional (8), secondary chromatic aberration occurs.
[embodiment]
Next, the embodiment 1～7 for representing the concrete numeric data of imaging lens system of the present invention, with reference to Fig. 2～Fig. 8, Fig. 9 A, 9B, 9C～Figure 15 A, 15B, 15C, Figure 16, table 1A, 1B～table 7A, 7B and table 8, is illustrated in the lump.Also have, the symbol in Fig. 2～Fig. 8 consistent with symbol in Fig. 1 of above-mentioned expression imaging lens system 100, represents the inscape corresponding to each other.
Also have, the formation of the lens combination shown in Fig. 2～Fig. 8, is illustrated in infinity object focus state constantly.
< embodiment 1 >
Fig. 2 is the imaging lens system about embodiment 1, the sectional view that the summary under the state of infintie object point focus forms.
Also have, the imaging lens system of embodiment 1, forms to meet the mode of above-mentioned full terms formula.
Table 1A represents the lens data of the imaging lens system of embodiment 1.At table in the lens data shown in 1A, face numbering i represent to using at the face that object side was configured as No. 1 and along with towards No. i that as side, increases successively (i=1,2,3 ...) the face numbering of face Si.Also have, the imaging surface that in the lens data of table 1A, also comprises aperture diaphragm St, do not possess the optical element LL of focal power and be formed with optical image Im is in interior and additional facet numbering.
The mark Ri of table in 1A represent No. i (i=1,2,3 ...) radius-of-curvature of face, mark Di represent i (i=1,2,3 ...) face interval on the optical axis Z1 of number face and i+1 face.The numbering i of mark Ri and mark Di, with represent lens face and aperture diaphragm etc. mark Si (i=1,2,3 ...) numbering i corresponding.
In addition, the optical element that the mark ndj of table in 1A represents to take object side as No. 1 along with towards No. j that as side, increases successively (j=1,2,3 ...) the refractive index to d line (wavelength 587.6nm) of optical element, vdj represents the Abbe number to d line of j optical element.
In addition, all key element of table described in 1B, represents respectively about the system-wide focal length of lens: f ', F number: FNo., full field angle: 2 ω value.
Also have, the numeric representation described in table 1A, 1B, making the system-wide focal length of lens when infintie object point focus is 1.0 and value during standardization.In addition, with regard to radius-of-curvature, when protruding to object side, for just, when protruding to picture side, be negative.
[table 1A]
Embodiment 1 lens data
[table 1B]
The all key elements of embodiment 1
Zoom interval
The aberration diagram that represents the imaging lens system of embodiment 1 in Fig. 9 A, 9B, 9C.Fig. 9 A means the figure that makes all aberration of this imaging lens system when infintie object point focus, Fig. 9 B means the figure that makes all aberration of this imaging lens system when the object point focus being positioned at as the 33.28mm of benchmark photo distance, Fig. 9 C means the figure that makes all aberration of this imaging lens system when being positioned at the object point focus of 7.49mm of the shortest photo distance (minimum distance, MOD:Minimum Object Distance).In addition, Fig. 9 A, 9B, 9C separately in, figure shown in mark (a) represents spherical aberration, figure shown in mark (b) represents sine condition violation amount, figure shown in mark (c) represents astigmatism, figure shown in mark (d) represents distortion, and the figure shown in mark (e) represents multiplying power chromatic aberation.
Also have, in Fig. 9 A, 9B, 9C, expression be about having all aberrations of light of each wavelength of d line, C line, F line, g line.
In addition, the solid line of astigmatism figure represents the aberration of sagitta of arc direction, and dotted line represents the aberration of meridian direction.In addition, the numerical value meaning of describing on the top of spherical aberration diagram and sine condition figure is F number, the numeric representation angle of half field-of view ω describing on other the top of aberration diagram.
In addition,, in each imaging lens system of embodiment 1～7, the value corresponding with each formula in above-mentioned conditional is illustrated in table 8.The value of the formula in table 8, can try to achieve according to table 1 to the lens data of each embodiment shown in table 7 etc.Also have, table 8 is illustrated in explanation last of embodiment.
Fig. 2 of the formation of the imaging lens system of expression above-described embodiment 1, Fig. 9 A, the 9B, the 9C that represent aberration, represent the table 1A of lens data and the table 1B of all key elements of expression, and represent about the read method of the table 8 of the value of each formula in conditional etc., in the figure about embodiment 2～7 described later, table, too, therefore in embodiment described later, the description thereof will be omitted.
< embodiment 2 >
Fig. 3 is the imaging lens system about embodiment 2, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 2, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 10 A, 10B, 10C mean the figure of aberration of the imaging lens system of embodiment 2.
At the following lens data of showing the imaging lens system of embodiment 2 shown in 2A, all key elements of the imaging lens system of embodiment 2 shown in table 2B.
[table 2A]
Embodiment 2 lens datas
[table 2B]
The all key elements of embodiment 2 (d line)
Zoom interval
< embodiment 3 >
Fig. 4 is the imaging lens system about embodiment 3, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 3, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 11 A, 11B, 11C mean the figure of aberration of the imaging lens system of embodiment 3.
The lens data of the imaging lens system of embodiment 3 shown in following table 3A, all key elements of the imaging lens system of embodiment 3 shown in table 3B.
[table 3A]
Embodiment 3 lens datas
[table 3B]
The all key elements of embodiment 3 (d line)
Zoom interval
< embodiment 4 >
Fig. 5 is the imaging lens system about embodiment 4, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 4, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 12 A, 12B, 12C represent the aberration diagram of the imaging lens system of embodiment 4.
The lens data of the imaging lens system of embodiment 4 shown in following table 4A, all key elements of the imaging lens system of embodiment 4 shown in table 4B.
[table 4A]
Embodiment 4 lens datas
[table 4B]
The all key elements of embodiment 4 (d line)
Zoom interval
< embodiment 5 >
Fig. 6 is the imaging lens system about embodiment 5, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 5, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 13 A, 13B, 13C represent the aberration diagram of the imaging lens system of embodiment 5.
The lens data of the imaging lens system of embodiment 5 shown in following table 5A, all key elements of the imaging lens system of embodiment 5 shown in table 5B.
[table 5A]
Embodiment 5 lens datas
[table 5B]
The all key elements of embodiment 5 (d line)
Zoom interval
< embodiment 6 >
Fig. 7 is the imaging lens system about embodiment 6, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 6, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 14 A, 14B, 14C represent the aberration diagram of the imaging lens system of embodiment 6.
The lens data of the imaging lens system of embodiment 6 shown in following table 6A, all key elements of the imaging lens system of embodiment 6 shown in table 6B.
[table 6A]
Embodiment 6 lens datas
[table 6B]
The all key elements of embodiment 6 (d line)
Zoom interval
< embodiment 7 >
Fig. 8 is the imaging lens system about embodiment 7, the sectional view that the summary under the state of infintie object point focus forms.
The imaging lens system of this embodiment 7, also forms to meet the mode of above-mentioned full terms formula.
In addition, Figure 15 A, 15B, 15C represent the aberration diagram of the imaging lens system of embodiment 7.
The lens data of the imaging lens system of embodiment 7 shown in following table 7A, all key elements of the imaging lens system of embodiment 7 shown in table 7B.
[table 7A]
Embodiment 7 lens datas
[table 7B]
The all key elements of embodiment 7 (d line)
Zoom interval
Following table 8, means the form with the corresponding value of each conditional as mentioned above.
Below, for embodiment 1 to embodiment 7, the embodiment 1 of take is especially described in detail as typical example.
First, with reference to Fig. 2, for the imaging lens system of embodiment 1, describe.
As shown in Figure 2, the imaging lens system of embodiment 1, by 4 groups, formed in fact, from object side dispose successively have negative power the 1st lens combination G1, aperture diaphragm St, have positive light coke the 2nd lens combination G2, have negative power the 3rd lens combination G3, there is the 4th lens combination G4 of positive light coke, only make the 3rd lens combination G3 move and focus along optical axis direction.
The 1st lens combination G1, from object side, configure successively biconvex lens L11, make convex surface towards the positive meniscus lens L12a of object side and balsaming lens L12, biconcave lens L13, biconvex lens L14, the biconcave lens L15 that convex surface forms towards the diverging meniscus lens L12b of object side, the little biconvex lens L16 facing to as side of absolute value that makes radius-of-curvature are formed, there is on the whole negative power.
The 2nd lens combination G2, has positive light coke on the whole, configures successively following lens form from object side: the diverging meniscus lens L21a and the biconvex lens L21b that make convex surface towards object side, consist of, have on the whole the balsaming lens L21 of positive light coke; By biconvex lens L22a and concave surface is formed towards the meniscus lens L22b of object side, there is on the whole the balsaming lens L22 of positive light coke.
The 3rd lens combination G3, only consists of the diverging meniscus lens L31 that makes convex surface towards object side.
The 4th lens combination G4, has positive light coke thing on the whole, configures successively following lens form from object side: the little biconvex lens L41 facing to side of absolute value that makes radius-of-curvature; Make concave surface towards the meniscus lens L42 with positive light coke (weak positive light coke) of object side.
3 lens L11, the L12a, the L12b that from object side, configure in the 1st lens combination G1, if from their shape, with Gaussian lens combination in the lens arrangement that more configures by object side of ratio diaphragm exactly like.But, with regard to 3 lens L11, L12a, L12b, the Abbe number of take is that the mode of large-little-large relation determines, the Abbe number of 3 lens in corresponding with it Gaussian lens combination determines that with large-large-little relation, in this point, design philosophy is different.
In the lens combination of Gaussian, utilize the lens that more configure by object side than diaphragm, spherical aberration, curvature of the image, astigmatism are to a certain degree proofreaied and correct, by diaphragm is clipped in therebetween and each lens of balanced configuration, thereby proofread and correct coma aberration, distortion.
The lens arrangement till 3 of object sides to the of the imaging lens system of embodiments of the invention 1, the 2nd positive meniscus lens L12a used the anomalous dispersion glass of the high dispersion of high index of refraction, and the 3rd diverging meniscus lens L12b used the anomalous dispersion glass of the low dispersion of low-refraction.According to these, form, can offset the multiplying power chromatic aberation, the secondary chromatic aberration that in subsequent group, occur, and that coma aberration is proofreaied and correct separately this point by the 1st lens combination G1 is different from Gaussian.
The 4th concavees lens L13, the 5th convex lens L14, be by the 4th of Gaussian lens combination with the 5th balsaming lens forming separated form in addition, but above-mentioned concavees lens L13, convex lens L14 focal power are separately than the situation of general Gaussian lens combination strong (greatly), in addition, because the object side of these lens in diaphragm, so have some different from the effect of the 4th, the 5th lens of general Gaussian lens combination.Above-mentioned the 4th lens L13 used high-dispersion glass, and the 5th lens L14 used Extra-low Dispersion glass, makes the chromatic aberation of this part proofread and correct superfluous.In below the 6th, the 7th, the 6th negative lens L15 used moderate dispersive glass, and the 7th positive lens L16 used high-dispersion glass, becomes and makes chromatic aberation that such formation occur.As the 1st lens combination G1 whole (separately), become axle colouring aberration correction not enough, multiplying power chromatic aberation obtains the state of proofreading and correct substantially.
With regard to spherical aberration, the 3rd lens L12b mainly bears the task of aberration correction as side S5 and the 4th lens L13, the lens L15 of the 6th.But, about curvature of the image, via the effect of these lens, will proofread and correct surplus.
The 2nd lens combination G2, balsaming lens L21, the biconvex lens L22a being formed by the diverging meniscus lens L21 a and the biconvex lens L21b that make convex surface towards object side successively from object side and concave surface is formed towards the balsaming lens L22 of the diverging meniscus lens L22b of object side.
With regard to balsaming lens L21, balsaming lens L22, at diverging meniscus lens L21a, L22b, use respectively high index of refraction high-dispersion glass, at biconvex lens L21b, L22a, use respectively low-refraction low dispersion, thus chromatic aberation, spherical aberration on axis calibration.
About the 2nd lens combination G2, the axle colouring aberration correction that the 2nd lens combination G2 is produced is superfluous, utilizes with the relation that has of the 1st lens combination G1 and is offset.With regard to multiplying power chromatic aberation, the 2nd lens combination G2 proofreaies and correct separately.With regard to curvature of the image, the independent undercorrection of the 2nd lens combination G2, is offset but utilize with the relation of the 1st lens combination G1.
The 3rd lens combination G3, consists of the 1 diverging meniscus lens L31 that makes convex surface towards object side, during from infinity to in-plant focusing to picture side shifting.By the 3rd lens combination G3 is consisted of the lens of such meniscus shape, the change of the spherical aberration in the time of can suppressing to focus.In this 3rd lens combination G3, spherical aberration, curvature of the image both sides all proofread and correct surplus.
The value of the formula in conditional (1) (| f3|/f) is 1.37.By so suitably determining focal power, the amount of movement of the 3rd lens combination G3 from infinity when closely focusing is included into appropriate scope.In addition, the lens that move during due to focusing are 1, so light weight.
The 4th lens combination G4, from object side configure successively make convex surface that the absolute value of radius-of-curvature is little towards the biconvex lens L41 of object side, concave surface is formed towards the meniscus lens L42 that has positive light coke (extremely weak positive light coke) of object side.
With regard to biconvex lens L41, increase the system-wide focal power of lens, there is effect realizing on fast lens (little FNo.).There is spherical aberration in the 4th lens combination G4, but between the 3rd lens combination G3 by its counteracting.
With regard to having the meniscus lens L42 of positive light coke (weak positive light coke), in the correction of spherical aberration, coma aberration, astigmatism, distortion effectively.
In addition, diaphragm St is clipped in the middle, the 1st lens combination G1 is for negative, and the 2nd lens combination G2 is just such formation, can play the effect that the angle of the marginal ray that makes to incide the 3rd lens combination G3 reduces, and the change of the field angle that focusing is brought suppresses very littlely.
As above, according to the imaging lens system of embodiments of the invention 1, can realize not only also imaging lens system seldom of the field angle change that causes for high-performance, focus groups but also light weight and focusing.
Next, with reference to Fig. 3, for the imaging lens system of embodiment 2, describe.
The formation of the imaging lens system of embodiment 2, the biconvex lens L14 (with reference to Fig. 2) of the 5th (the 5th) that makes the imaging lens system of embodiment 1, be altered to and make convex surface towards the laminating of positive meniscus lens L14a and the biconvex lens L14b of object side, in addition all with the formation common (being equal to) of the imaging lens system of this embodiment 1.At this, by the lens with respect to having strong convex surface, use the glass material that refractive index is high, effective for the correction of curvature of the image.
Secondly, with reference to Fig. 4, for the imaging lens system of embodiment 3, describe.
The formation of the imaging lens system of embodiment 3, rear at the lens L14 (with reference to Fig. 2) of the 5th of the imaging lens system of embodiment 1, append and make concave surface towards (focal power is weak) positive meniscus lens L15 of object side, in addition all with the formation common (being equal to) of the imaging lens system of this embodiment 1.The positive meniscus lens L15 that this appends, produces effect for micro-correction of spherical aberration, coma aberration, curvature of the image etc.
Then, with reference to Fig. 5, for the imaging lens system of embodiment 4, describe.
The formation of the imaging lens system of embodiment 4, has omitted the meniscus lens L42 configuring as side at the imaging lens system of embodiment 1, in addition all with the formation common (being equal to) of the imaging lens system of this embodiment 1.Along with omitting this meniscus lens L42, for other lens, implement the correction of radius-of-curvature etc.Spherical aberration, coma aberration, curvature of the image, astigmatism, distortion etc., although have a bit too lately with respect to the performance of the imaging lens system of embodiment 1, but still have the performance that meets fully object.
Then, with reference to Fig. 6, for the imaging lens system of embodiment 5, describe.
The formation of the imaging lens system of embodiment 5, by the balsaming lens L21 (with reference to Fig. 5) of the object side of the 2nd lens combination G2 of the imaging lens system of embodiment 4, be altered at the simple lens L21 little and that there is positive light coke of the absolute value as side radius-of-curvature (with reference to Fig. 6), in addition all with the formation common (being equal to) of the imaging lens system of embodiment 4.In the imaging lens system of embodiment 5, the balsaming lens L22 as side of the 2nd lens combination G2 becomes large in order to relax the burden of multiplying power chromatic aberation correction, and expansion obtains the simple lens L21 of object side and the interval of the balsaming lens L22 of picture side of the 2nd lens combination G2, improve surrounding visual field angle light to the height of incidence on the composition surface of balsaming lens L22.
Then, with reference to Fig. 7, for the imaging lens system of embodiment 6, describe.
The formation of the imaging lens system of embodiment 6, the simple lens L31 (with reference to Fig. 2) of the 3rd lens combination G3 that makes to form the imaging lens system of embodiment 1, become the balsaming lens L31 (with reference to Fig. 7) that engages positive lens L31a and negative lens L31b, alleviate the change of the chromatic aberation in when focusing, except this point all with the formation common (being equal to) of the imaging lens system of embodiment 1.
Then, with reference to Fig. 8, for the imaging lens system of embodiment 7, describe.
The formation of the imaging lens system of embodiment 7, to make the 3rd lens combination G3 of imaging lens system of embodiment 5 as by the negative lens balsaming lens L31 that (negative lens L31a, negative lens L31b) forms each other, except this point, all with the formation common (being equal to) of the imaging lens system of this embodiment 5.
Also have, the lens data of any one embodiment (table 1A～table 7A) is all that to make the system-wide focal length of lens be 1 to carry out standardization, but, can certainly conform to the size that receives the light receiving surface of the light by imaging lens system, for the additional multiplying power arbitrarily of said lens data, carry out ratio amplification, ratio dwindles to form each imaging lens system.
Shown in Figure 16, as an example of the camera head of embodiments of the present invention, used the summary pie graph of camera head of the imaging lens system of embodiments of the present invention.As the example of such camera head, can enumerate digital camera, play for the small-sized and high performance imaging lens system that uses with video camera etc. of camera, film shooting.
Camera head 200 shown in Figure 16, possesses as follows: imaging lens system 100; Shooting is by the imaging apparatus 210 of the optical image Im of the subject of imaging lens system 100 imagings; For expression, from the picture signal Gs as output signal of the optical image Im of imaging apparatus 210, carry out the signal processing part 4 of calculation process.With regard to imaging lens system 100, the lens combination moving during using focusing conceptually represents each lens combination as the 3rd lens combination G3.The light receiving surface 210j of imaging apparatus 210 is consistent with the image planes Im of imaging lens system 100 and configure.As imaging apparatus 210, such as using CCD element and cmos element etc.Also have, between imaging lens system 100 and imaging apparatus 210, dispose optical filter LL.
In addition, camera head 200, possesses for the 3rd lens combination G3 of imaging lens system 100 is moved and the focusing control part 6 of focus (making it focus).Also have, although not shown in Figure 16, camera head 200 also can possess for changing the diaphragm control part of the diaphragm diameter of aperture diaphragm St.
Above, enumerate embodiment and embodiment has illustrated the present invention, but the present invention is not limited by the above-described embodiment and examples, but can carry out various distortion.For example, the value of the radius-of-curvature of each lens, face interval, refractive index, Abbe number etc., is not defined as the value shown in above-mentioned each Numerical implementation example, can get other value yet.
Claims (25)
1. an imaging lens system, is characterized in that,
By the 1st lens combination, the diaphragm with negative power configuring successively from object side, the 2nd lens combination with positive light coke, the 3rd lens combination with negative power, these 4 groups with the 4th lens combination of positive light coke, formed in fact,
Only make described the 3rd lens combination move to focus along optical axis direction,
Described the 1st lens combination, from object side successively by biconvex lens, make balsaming lens that the lens that have the lens of positive light coke and have negative power engage, contain the poly-lens that there are the lens of positive light coke and there are the lens of negative power and form,
Described the 2nd lens combination contains: by thering are the lens of positive light coke and thering is the balsaming lens that the lens of negative power form,
Described the 3rd lens combination, by the simple lens with negative power or the poly-lens that are meniscus shape that make convex surface towards object side, formed, this poly-lens has negative power on the whole, and in this poly-lens the absolute value by the radius-of-curvature of the lens face that configures as side is less than the absolute value of the radius-of-curvature of the lens face configuring by object side
Described the 4th lens combination contains the lens with positive light coke,
Meet following conditional,
0.7＜|f3|/f＜4.0…(1)
Wherein,
F3: the focal length of the 3rd lens combination,
F: the system-wide focal length of lens under the state of infintie object point focus.
2. imaging lens system according to claim 1, is characterized in that,
Meet following conditional,
1.0＜|f3|/f＜3.0…(1′)。
3. imaging lens system according to claim 1, is characterized in that,
Meet following conditional,
1.2＜|f3|/f＜2.0…(1″)。
4. according to the imaging lens system described in any one in claims 1 to 3, it is characterized in that,
Meet following conditional,
0.6＜|f1|/f＜18.0…(2)
Wherein,
F1: the focal length of the 1st lens combination,
F: the system-wide focal length of lens under the state of infintie object point focus.
5. imaging lens system according to claim 4, is characterized in that,
Meet following conditional,
1.2＜|f1|/f＜10.0…(2′)。
6. imaging lens system according to claim 4, is characterized in that,
Meet following conditional,
2.5＜|f1|/f＜4.5…(2″)。
7. according to the imaging lens system described in any one in claim 1 to 6, it is characterized in that,
Meet following conditional,
0.2＜f2/f＜5.0…(3)
Wherein,
F2: the focal length of the 2nd lens combination,
F: the system-wide focal length of lens under the state of infintie object point focus.
8. imaging lens system according to claim 7, is characterized in that,
Meet following conditional,
0.5＜f2/f＜3.5…(3′)。
9. imaging lens system according to claim 7, is characterized in that,
Meet following conditional,
0.8＜f2/f＜1.2…(3″)。
10. according to the imaging lens system described in any one in claim 1 to 9, it is characterized in that,
Meet following conditional,
0.8＜f4/f＜8.0…(4)
Wherein,
F4: the focal length of the 4th lens combination,
F: the system-wide focal length of lens under the state of infintie object point focus.
11. imaging lens systems according to claim 10, is characterized in that,
Meet following conditional,
1.0＜f4/f＜4.0…(4′)。
12. imaging lens systems according to claim 10, is characterized in that,
Meet following conditional,
1.3＜f4/f＜1.8…(4″)。
13. according to the imaging lens system described in any one in claim 1 to 12, it is characterized in that,
Meet following conditional,
0.5＜(R3f+R3r)/(R3f-R3r)＜6.0…(5)
Wherein,
R3f: the radius-of-curvature at the lens face configuring by object side of the 3rd lens combination,
R3r: the 3rd lens combination by the radius-of-curvature of the lens face that configures as side.
14. imaging lens systems according to claim 13, is characterized in that,
Meet following conditional,
1.0＜(R3f+R3r)/(R3f-R3r)＜4.5…(5′)。
15. imaging lens systems according to claim 13, is characterized in that,
Meet following conditional,
1.3＜(R3f+R3r)/(R3f-R3r)＜2.5…(5″)。
16. according to the imaging lens system described in any one in claim 1 to 15, it is characterized in that,
Described the 1st lens combination comprise by thering are the lens of positive light coke and thering is at least 1 among the balsaming lens that the lens of negative power form, meet following conditional,
22.0＜|vd(1P)-vd(1N)|…(6)
Wherein,
Vd (1P): form the Abbe number of the lens with positive light coke of balsaming lens,
Vd (1N): the Abbe number that forms the lens with negative power of balsaming lens.
17. imaging lens systems according to claim 16, is characterized in that,
Meet following conditional,
35.0＜|vd(1P)-vd(1N)|…(6′)。
18. imaging lens systems according to claim 16, is characterized in that,
Meet following conditional,
50.0＜|vd(1P)-vd(1N)|…(6″)。
19. imaging lens systems according to claim 16, is characterized in that,
Meet following conditional,
vd(1P)-vd(1N)＜-22.0…(6″′)。
20. imaging lens systems according to claim 16, is characterized in that,
Meet following conditional,
vd(1P)-vd(1N)＜-35.0…(6″″)。
21. according to the imaging lens system described in any one in claim 1 to 20, it is characterized in that,
In described the 1st lens combination, at the lens as side configuration with positive light coke that lean on most of the 1st lens combination,
Described the 2nd lens combination comprise by thering are the lens of positive light coke and thering is the balsaming lens of absolute value maximum of the difference of the Abbe number between 2 lens among the balsaming lens that the lens of negative power form, that be engaged with each other, meet following conditional (7), and, described the 1st lens combination by there are the lens of positive light coke described in side configuration, meet following conditional (8)
20.0＜|vd(2P)-vd(2N)|…(7)
vd(1R)＜35.0…(8)
Wherein,
Vd (2P): form the Abbe number of the lens with positive light coke of balsaming lens,
Vd (2N): form the Abbe number of the lens with negative power of balsaming lens,
Vd (1R): the Abbe number at the lens that configure by picture side of the 1st lens combination.
22. imaging lens systems according to claim 21, is characterized in that,
Meet following conditional,
32.0＜|vd(2P)-vd(2N)|…(7′)。
23. imaging lens systems according to claim 21, is characterized in that,
Meet following conditional,
48.0＜|vd(2P)-vd(2N)|…(7″)。
24. imaging lens systems according to claim 21, is characterized in that,
Meet following conditional,
vd(1R)＜30.0…(8′)。
25. 1 kinds of camera heads, is characterized in that,
Possesses the imaging lens system described in any one in claim 1 to 24.
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| PCT/JP2013/000519 WO2013118470A1 (en) | 2012-02-06 | 2013-01-31 | Imaging lens and imaging device equipped with same |
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- 2013-01-31 CN CN201380008213.2A patent/CN104094153B/en active Active
- 2013-01-31 WO PCT/JP2013/000519 patent/WO2013118470A1/en active Application Filing
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2014
- 2014-08-05 US US14/451,459 patent/US9207440B2/en active Active
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| US5745306A (en) * | 1995-05-26 | 1998-04-28 | Nikon Corporation | Internal focusing telephoto lens |
| JP2004126392A (en) * | 2002-10-04 | 2004-04-22 | Nikon Corp | Diffraction optical element |
| CN1627118A (en) * | 2003-12-12 | 2005-06-15 | 里程碑株式会社 | Imaging lens |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360457A (en) * | 2014-11-06 | 2015-02-18 | 中国科学院光电技术研究所 | Broadband fiber-CCD (charge coupled device) coupling imaging lens |
| CN108139573A (en) * | 2015-09-18 | 2018-06-08 | 株式会社尼康 | Variable-power optical system, Optical devices, photographic device, variable-power optical system manufacturing method |
| CN108139573B (en) * | 2015-09-18 | 2020-12-15 | 株式会社尼康 | Variable magnification optical system, optical device, and imaging device |
| CN107894648A (en) * | 2016-10-04 | 2018-04-10 | 富士胶片株式会社 | Imaging len and camera device |
| CN107894648B (en) * | 2016-10-04 | 2021-10-19 | 富士胶片株式会社 | Imaging lens and imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104094153B (en) | 2016-04-13 |
| JP5616540B2 (en) | 2014-10-29 |
| US9207440B2 (en) | 2015-12-08 |
| WO2013118470A1 (en) | 2013-08-15 |
| JPWO2013118470A1 (en) | 2015-05-11 |
| US20140340763A1 (en) | 2014-11-20 |
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